Chapter 19:
Koto takes her mother from the Shrine's Holy Grounds to the Looking Glass City.
Chapter 20:
The three siblings enjoy their time with their mother, but...
Chapter 21:
Koto tries to find out the secret of her birth from her mother, but instead she's asked to save her poor father.  With no place for her feelings to go, she takes them out on Myoue.
Your hair's nice and straight, 
just like your dad's.
Dein Haar ist schön und glatt,
 wie das von deinem Vater.
Tu cabello es suave y 
liso como el de tu papá.
Tienes el pelo suave y 
liso como el de tu padre.
Tes cheveux sont aussi doux 
que ceux de ton père.
Seu cabelo é bonito e liso como o do seu pai.